Abstract
NEW experiments on the winter development of the gonads in the migratory finch, Junco hyemails, under the influence of artificial illumination are described by Prof. Wm. Rowan. The author also submits photographs showing that starlings in the West End of London have in winter larger testes or ovaries than those in the country. He finds, however, that the light intensity at night, at the spot where the London birds roosted, was below that known to induce development of the sex organs, and he suggests that in this case the effect may be due to the noise which keeps the birds intermittently awake until the early hours of the morning.
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Points from Foregoing Letters. Nature 139, 677 (1937). https://doi.org/10.1038/139677b0
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DOI: https://doi.org/10.1038/139677b0